Breach Of agreement

On Monday, 13th April I enquired about a Used Hyundai i30 for sale at CMH Chevrolet Boksburg. I test drove the car late that same afternoon, and asked for a quotation the following day. I received this quote on Tuesday with a 7 day validity. I then emailed David with a few questions and called him to say I was interested in buying and had to sort out a valuation on the extended warranty on my existing car. He agreed. The very next day, Wednesday,I sent an email saying that I would definitely buy the car, followed up the following morning at 8.30am with a phone call to confirm he had received the mail and asked for the procedure to follow since I was trading in my Hyundai ix35. He said he was waiting for paperwork from the bank and that he would bring the car to me. I was to confirm whether I would be selling the ix35 together with the extended warranty or not. At 11.16am I received a call to say the car had been sold to someone else! I was furious as at no time was I told there was any question of me not being able to purchase the car, indeed the quotation had a validity of SEVEN days and I was awaiting confirmation from the insurers re the extended warranty. I am disgusted.